QCommandLineParser: No stdout output after process()

kkettinger

Hello,

i want to extend the --help output with some examples, but it seems i can't output anything to stdout after the call to process() was made:

#include <iostream>
#include <QCoreApplication>

int main(int argc, char *argv[])
{
    QCoreApplication app(argc, argv);
    QCoreApplication::setApplicationName("my-copy-program");
    QCoreApplication::setApplicationVersion("1.0");

    QCommandLineParser parser;
    parser.setApplicationDescription("Test helper");
    parser.addHelpOption();

    std::cout << "stdout before parser.process" << std::endl;

    parser.process(app);

    std::cout << "stdout after parser.process" << std::endl;

    return 0;
}

When i call the exe directly, i get this:

stdout before parser.process
stdout after parser.process

When calling with --help:

stdout before parser.process
Usage: example.exe [options]
Test helper

Options:
  -?, -h, --help  Displays help on commandline options.
  --help-all      Displays help including Qt specific options.

(no output of "stdout after parser.process")

That doesn't make sense to me. Why is that?
Thanks.

Best regards,
Kevin

Christian Ehrlicher

Perfectly documented:

The builtin options are --version if addVersionOption was called and --help / --help-all if addHelpOption was called.

When invoking one of these options, or when an error happens (for instance an unknown option was passed), the current process will then stop, using the exit() function.

kkettinger

I've looked but must have missed it. Thank you.